~$ rvm install 1.9.3-head
No bison!
~$ rvm requirements
I was on XCode 3 (from Snow Leopard) – Need minimum 4.1 for Lion – NO 4.3!
XCode 4.3.3 from App Store June 12, 2012
XCode Command Line Tools (Pref->Downloads)
rvm says DOWNGRADE XCode 4.3! (If problems)
~$ rvm install 1.9.3-head
No autoreconf!
install homebrew (because of autoconf)
brew install automake
~$ rvm install 1.9.3-head – worked!
rvm use 1.9.3-head –default
gem install rails